Boron-containing precipitated silica

Details Boron-containing precipitated silica Boron-containing precipitated silica

C - Chemistry, Metallurgy

08

K

6/212

C08K 3/36 (2006.01) A01N 59/14 (2006.01) C08K 3/38 (2006.01) C09C 1/30 (2006.01)

Patent

CA 1110406

ABSTRACT OF THE DISCLOSURE The present invention provides a boron-containing pre- cipitated silica, characterized by the following physical-chemical characteristic data: loss on ignition (DIN 55921) % by weight 14-40 pH value (DIN 53200) 4-6 conductivity in a 4% aqueous dispersion µS <800 tamped powder density (DIN 53194) g/litre 130?100 screenings according to Alpine >63 µm % by weight <0.1 SiO2 content (DIN 55921) but relative to to original substance % by weight 9-76 B2O3 content relative to the original substance % by weight 10-51 Na2O content relative to the original substance % by weight <0.5 SO3 content relative to the original substance % by weight <0.8 The boron-containing precipitated silica is inter alia useful as a filler in materials based on di-organo polysiloxanes hardenable to elastomers.

330846

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